the hemi has 2 plugs per hole so that means that one plug fires at the top of the compresion
stroke and one fires on the down side of the power for a better or a comp burn. if running nitrous can the 1st be 2settings colder and the 2nd plug stock? that way you can run a bigger shot

 

Actually, both plugs fire on the compression, and both plugs fire on the exhaust. It's called wasted spark. So both plugs should be the same.